Problem Frame Diagram: Simple Information Answers The arrowhead on the dashed line indicates that the requirement constrains the Responses; the absence of arrowheads on the other dashed lines indicates that does not constrain either the Real World or the Enquirer. The problem is to construct a simple information system (Response Machine) that answers enquiries. Enquiries in the form of an unstructured stream of events E4 come from an autonomous Enquirer; the Enquirer is a biddable domain, as

Problem Frame Diagram: Simple Information Answers The arrowhead on the dashed line indicates that the requirement constrains the Responses; the absence of arrowheads on the other dashed lines indicates that does not constrain either the Real World or the Enquirer. The problem is to construct a simple information system (Response Machine) that answers enquiries. Enquiries in the form of an unstructured stream of events E4 come from an autonomous Enquirer; the Enquirer is a biddable domain, as

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